Like all Encores so far, its going to be released in a G1-styled box that is reminiscent of his 1987 release as C-114: Fortress Maximus in Japan. What a great time to be a Trans-fan.
Encore Fortress Maximus is slated for a November 2012 release, just in time to treat yourself to Xmas.
Rumour has it that eHobby, which has been silent for some years, is going to release an exclusive repaint of Fortress Maximus as Solar System Commander, C-311: Grand Maximus!
I've already pre-ordered 3 pieces to form a mega-humongous-gargantuar Autobot City with my existing C-114.
Regular Retail Price tentatively set as ¥35,000 (USD$430 approximately).
Pre-Order details and Source (originally reported by veteran Trans-Fan Goktimus Prime)